mixer? Next, let's explain it to you:

mixing with an open mixer is an early mixing method in the rubber industry. Compared with the internal mixer mixing, the open mixer mixing labor intensity, production efficiency, unsafe, pollution of the environment, and mixing uniformity is poor, therefore, has tended to be gradually eliminated. But with the open mill mixing, flexibility is greater, mixing glue is suitable for the production of small scale, rubber batch small and variety of factories. For the production of some special rubber materials, such as sponge rubber, hard rubber, color rubber, etc., it is particularly suitable to mix with an open mill, so the use of open mill mixing in small rubber plants still occupies a certain proportion. The third stage of

turning and mixing is turning. Due to the high viscosity of the rubber, the rubber material only produces circumferential flow along the rotation direction of the roller of the open mill during mixing, but there is no axial flow, and the rubber flowing along the circumferential direction is only laminar flow, so the rubber layer close to the surface of the front roller at about 1/3 of the film thickness cannot produce flow and becomes a "dead layer" or "sluggish layer". In addition, the accumulation of glue on the upper part of the roll gap will form a part of the wedge-shaped "reflux zone". The above reasons all make the compounding agent in the rubber compound unevenly dispersed.

Due to the high viscosity of the rubber, the fluidity of the rubber material near the roller surface is poor, and the shear force promotes the rubber flow to be only laminar. The compounding agent in the inner layer of about 1/3 thick film in contact with the roller surface cannot enter, forming a "dead layer".

Open Mill Mixing Operation Method During the open mill mixing operation, raw rubber, mother rubber or mixed rubber is generally added along one end of the big cone, and then various compounding agents are added for mixing according to the specified dosing sequence. The dosing method during mixing is divided into two types according to the gum content of the formula: for those with high raw gum content, the compounding agent is added in the middle of the roller, the mixer is opened and the glue extraction and dosing method is adopted to keep a proper amount of accumulated glue between the two rollers; For those with low content of raw rubber, the compounding agent is added at one end by using the glue exchange dosing method. The compounding agent with less amount of mixed rubber and the carbon black with high flying pollution are usually added in the form of master glue or paste.

mixing generally uses a one-stage mixing method, but if it is natural rubber and a large amount of synthetic rubber and carbon black filling a large amount of rubber, a two-stage mixing method can be used to make the rubber and the compounding agent more evenly mixed.

When all the compounding agents are added, turn them over to further mix the compound. The mixing rubber turning method has the manual cutting method and the mechanical cutting knife method. Manual cutting method generally uses left and right cutting knife, folding twist, beating triangle bag and cutting knife roll, etc. The mechanical cutter method is to install a mechanical cutter near the front roller, cut along the surface of the roller to make the glue fall into the plate, and then feed it into the roller room for several times. After turning, relax the roll distance (4~5mm), and then use the cutting method to supplement turning for 2~3 times and then lower the sheet.